Recently we had an issue where an Email was being looped in our Exchange. This caused the bandwidth to skyrocket and slowed the sytem right down.
We were able to stop the problem by blocking the senders domain. It then just took a while for the thousands of emails left the in queues to filter out.
Basically what happened was, an email was sent to an address at our domain that didnt exist. Our exchange responded with a non delivery report. The address that the original email was sent from also didnt actually exists so the email got stuck in an endless loop.
Is there a way to stop this happening in Exchange 2003?